US2684979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of acrylonitrile
Assignee: Monsanto Chemicals Ltd
•
Filing: 1951-04-02
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Granted: 1954-07-27
•
Expires: 1971-04-02
Abstract
No abstract record available.
Inventors
- 👤 Ralph R Wenner
- 👤 Gordon H Lovett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:03
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
THE PROCESS WHICH COMPRISES CONTACTING A CRUDE ACRYLONITRILE CONTAINING WATER-SOLUBLE IMPURITIES WITH AN AMOUNT OF WATER SUFFICIENT TO DISSOLVE AT LEAST 10% BUT NOT SUBSTANTIALLY IN EXCESS OF 35% BY WEIGHT THEREOF, SAID CONTACTING BEING CARRIED OUT IN A SERIES OF ALTERNATING QUIESCENT AND AGITATED ZONES, AND RECOVERING ACRYLONITRILE SUBSTANTIALLY FREE OF SAID IMPURITIES.
Claim 2
Dependent Claim
54 words
THE PROCESS WHICH COMPRISES CONTACTING A CRUDE ACRYLONITRILE CONTAINING WATER-SOLUBLE IMPURITIES WITH AN AMOUNT OF WATER SUFFICIENT TO DISSOLVE AT LEAST 10% BUT NOT SUBSTANTIALLY IN EXCESS OF 35% BY WEIGHT THEREOF, SAID CONTACTING BEING CARRIED OUT IN A SERIES OF ALTERNATING QUIESCENT AND AGITATED ZONES, AND RECOVERING ACRYLONITRILE SUBSTANTIALLY FREE OF SAID IMPURITIES.
References Cited (Backward Citations)
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Cited
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US2385549A
Cited
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Cited
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Cited
US2579638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |